public class User {
    private long id;
    private long password;
    private String email;


    public User(long id, long password, String email) {
        this.id = id;
        this.password = password;
        this.email = email;
    }

    public User(long id, long password) {
        this.id = id;
        this.password = password;

        this.email = "";

    }

    public void show() {
        System.out.println("用户账号：" + id);
        System.out.println("用户密码：" + password);
        System.out.println("用户邮箱：" + email);
        System.out.println();
    }

    public static void main(String[] args) {
        User user1 = new User(13356187785L, 123456L);
        user1.show();
        User user2 = new User(13356187786L, 123457L, "3426211479@qq.com");
        user2.show();
    }
}